An oil-soluble dye is mixed with emulsion and the emulsion remains colourless. Then, it is

Options

A. O-in-W
B. W-in-O
C. O-in-O
D. W-in-W

Answer

To solve the question, we need to analyze the behavior of an oil-soluble dye when mixed with an emulsion and determine what type of emulsion it is based on the information provided.

### Step-by-Step Solution:

1. **Understanding Emulsions**:
- Emulsions are colloidal systems where two immiscible liquids are mixed. There are two main types:
- Oil in Water (O/W): Oil droplets are dispersed in water.
- Water in Oil (W/O): Water droplets are dispersed in oil.

2. **Identifying the Components**:
- The question states that an oil-soluble dye is mixed with an emulsion. This means the dye is soluble in oil, not in water.

3. **Analyzing the Color Change**:
- When the oil-soluble dye is mixed with the emulsion and the emulsion remains colorless, it indicates that the dye did not disperse in the emulsion.

4. **Considering the Emulsion Types**:
- If the emulsion were Oil in Water (O/W), the dye would not mix with the water phase and would remain separate, thus keeping the emulsion colorless.
- If the emulsion were Water in Oil (W/O), the oil-soluble dye would mix with the oil phase, coloring the emulsion.

5. **Conclusion**:
- Since the emulsion remains colorless after mixing with the oil-soluble dye, it confirms that the emulsion is Oil in Water (O/W). The dye cannot color the emulsion because it is not soluble in the water phase.

### Final Answer:
The emulsion is **Oil in Water (O/W)**.

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